Question

我有2个recyclerView作为下图，当我滚动第二个recylcer视图时，第一个回收器仍然固定的问题。当我在第二个Recyclerview中向下滚动时，我希望第一个消失。如果我在上面滚动，则会出现recyclerview 1。怎么做？

主要活动代码：

   protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
       // initToolbars();

        recyclerView = (RecyclerView) findViewById(R.id.recyclerview1);
        recylerViewLayoutManager = new LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false);
        recyclerView.setLayoutManager(recylerViewLayoutManager);
        recyclerViewAdapter = new RecyclerViewAdapter(MainActivity.this, subjects,images);
        recyclerView.setAdapter(recyclerViewAdapter);


        MainGridRecView = (RecyclerView) findViewById(R.id.maingridrc);
        MainGridRecViewLayoutManager = new GridLayoutManager(context,2);
        MainGridRecView.setLayoutManager(MainGridRecViewLayoutManager);
        MainGridRecViewAdapter = new MainGridRecyclerViewAdapter(MainActivity.this, subjects,images);
        MainGridRecView.setAdapter(MainGridRecViewAdapter);

活动xml：

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/liner1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>


    <TextView
        android:id="@+id/textView3"
        android:layout_width="match_parent"
        android:layout_height="25dp"
        android:layout_above="@+id/recyclerview1"
        android:gravity="center"
        android:background="#10bcc9"
        android:textColor="@android:color/white"
        android:text="New Games." />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview1"
        android:layout_width="wrap_content"
        android:layout_height="140dp"
        android:scrollbars="horizontal" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="match_parent"
        android:layout_height="25dp"
        android:layout_below="@+id/recyclerview1"
        android:gravity="center"
        android:background="#10bcc9"
        android:textColor="@android:color/white"
        android:text="Used Games." />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/maingridrc"
        android:layout_width="wrap_content"
        android:layout_height="330dp"
        android:layout_marginTop="5dp"
        android:scrollbars="vertical" />

  <!--  <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />-->
</LinearLayout>

适配器

public class RecyclerViewAdapter extends RecyclerView.Adapter<Viewholder>{

    String[] SubjectValues;
    String[] imageValues;
    Context mContext;
    View view1;
    ViewHolder viewHolder1;
  // TextView textView;

    public RecyclerViewAdapter(Context context,String[] SubjectValues1, String[] images){

        SubjectValues = SubjectValues1;
        imageValues= images;
        mContext = context;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{

        public ViewHolder(View v){

            super(v);

        }
    }

    @Override
    public Viewholder onCreateViewHolder(ViewGroup parent, int viewType){

        view1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items,parent,false);

      //  viewHolder1 = new Viewholder(view1);

        Viewholder vh = new Viewholder(view1, new Viewholder.IMyViewHolderClicks() {
            public void onPotato(View caller) { Log.d("VEGETABLES", "Poh-tah-tos");
                Intent intent = new Intent(mContext,SingleObjectActivity.class);
                mContext.startActivity(intent);
            };
            public void onTomato(ImageView callerImage) {
                Log.d("VEGETABLES", "To-m8-tohs");

                //  v1    CategoryList mDataset = new CategoryList(getOrder(), getId(), item.getUrl(), item.getUserName(), item.getLikes());

                Intent intent = new Intent(mContext,SingleObjectActivity.class);
                mContext.startActivity(intent);
            }
        });

        return vh;
    }

    @Override
    public void onBindViewHolder(Viewholder holder, int position){

        holder.txtViewTitle.setText(SubjectValues[position]);
        holder.imgViewIcon.setImageResource(R.drawable.ghost_recon);
    }

    @Override
    public int getItemCount(){

        return SubjectValues.length;
    }
}

recycler xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/imagecateg"
        android:layout_width="180dp"
        android:layout_height="160dp"
        android:layout_alignParentTop="true"
        />

    <TextView
        android:id="@+id/txtview"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/imagecateg"
        android:paddingLeft="35dp"
        android:textSize="15dp"
        android:textStyle="bold"
        android:background="#f4e04c"
        android:textColor="@color/colorPrimary"
        />
    </RelativeLayout>

修改

Answer 1

修改*

这是另一种方法，代码基于here，我在我的项目中自己尝试了代码，结果如下图所示。

recyclerView.setOnScrollListener(new HidingScrollListener() { @Override public void yourhideviewmethod() { hideview(); } @Override public void yourshowviewmethod() { showview(); } }); } // animation code to hide and show public void hideview(){ yourview.animate().translationY(-yourview.getHeight()).setInterpolator(new AccelerateInterpolator(2)). setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); yourview.setVisibility(View.GONE); } }); } public void showview(){ yourview.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)). setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); yourview.setVisibility(View.VISIBLE); } }); }

然后创建扩展RecyclerView.OnScrollListener
的类
public abstract class HidingScrollListener extends RecyclerView.OnScrollListener { private static final int HIDE_THRESHOLD = 20; private int scrolledDistance = 0; private boolean controlsVisible = true; @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) { yourhideviewmethod(); controlsVisible = false; scrolledDistance = 0; } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) { yourshowviewmethod(); controlsVisible = true; scrolledDistance = 0; } if((controlsVisible && dy>0) || (!controlsVisible && dy<0)) { scrolledDistance += dy; } } public abstract void yourhideviewmethod();; public abstract void yourshowviewmethod();; }

Answer 2

看看下面的例子，

MainActivity.class

firebase.database().ref('page_id/user1/messages').orderByChild('timestamp').endAt(1502791814)
   .on('value',function(snap){
    //Now snap is an array of nodes that you wanted
    //Each node can be reached by using the following
    snap.forEach(function(eachSnap){
    //Complete here for update stuff

    });

});

activity_main.xml中

public class MainActivity extends AppCompatActivity {

    List<String> horizontalArrayList = new ArrayList<>();
    List<String> verticalArrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        verticalArrayList.add("fake entry");

        for(int i=0;i<20;i++){
            horizontalArrayList.add("user "+i);
        }
        for(int i=0;i<40;i++){
            verticalArrayList.add("user "+i);
        }

        RecyclerView verticalRecyclerView = (RecyclerView) findViewById(R.id.verticalRecyclerView);
        verticalRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        VerticalAdapter mAdapter = new VerticalAdapter(this, horizontalArrayList,verticalArrayList);
        verticalRecyclerView.setAdapter(mAdapter);
    }
}

HorizontalAdapter.class

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.recyclerviewdemo.android.activities.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/verticalRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical" />
</RelativeLayout>

item_horizontal.xml

public class HorizontalAdapter extends RecyclerView.Adapter<HorizontalAdapter.MyViewHolder> {

    private List<String> mArrayList = new ArrayList<>();

    private Context mContext;

    public HorizontalAdapter(Context mContext, List<String> mArrayList) {
        this.mContext = mContext;
        this.mArrayList = mArrayList;
    }

    @Override
    public HorizontalAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.item_horizontal, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(HorizontalAdapter.MyViewHolder holder, int position) {
        holder.textView.setText(mArrayList.get(position));
    }

    @Override
    public int getItemCount() {
        return mArrayList.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        public MyViewHolder(View v) {
            super(v);
            textView = (TextView) v.findViewById(R.id.textView);
        }
    }
}

VerticalAdapter.class

<LinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:background="@color/colorAccent"
        android:padding="5dp" />
</LinearLayout>

item_vertical.xml

public class VerticalAdapter extends RecyclerView.Adapter<VerticalAdapter.MyViewHolder> {

    private int ITEM_TEXT_VIEW = 0, ITEM_HEADER_VIEW = 1;

    private List<String> mVerticalArrayList = new ArrayList<>();
    private List<String> mHorizontalArrayList = new ArrayList<>();

    private Context mContext;


    public VerticalAdapter(Context mContext, List<String> mHorizontalArrayList,List<String> mVerticalArrayList) {
        this.mContext = mContext;
        this.mVerticalArrayList = mVerticalArrayList;
        this.mHorizontalArrayList = mHorizontalArrayList;
    }

    @Override
    public VerticalAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.item_vertical, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(VerticalAdapter.MyViewHolder holder, int position) {
        if (getItemViewType(position) == ITEM_HEADER_VIEW) {
            holder.recyclerView.setLayoutManager(new LinearLayoutManager(mContext,
                LinearLayoutManager.HORIZONTAL, false));
            HorizontalAdapter mAdapter = new HorizontalAdapter(mContext, mHorizontalArrayList);
            holder.recyclerView.setAdapter(mAdapter);
            holder.textView.setVisibility(View.GONE);
        } else {
            holder.textView.setText(mVerticalArrayList.get(position));
            holder.recyclerView.setVisibility(View.GONE);
        }
    }

    @Override
    public int getItemCount() {
        return mVerticalArrayList.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0) {
            return ITEM_HEADER_VIEW;
        } else {
            return ITEM_TEXT_VIEW;
        }
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        RecyclerView recyclerView;

        public MyViewHolder(View v) {
            super(v);
            textView = (TextView) v.findViewById(R.id.textView);
            recyclerView = (RecyclerView) v.findViewById(R.id.horizontalRecyclerView);
        }
    }
}

两个recylcerview在一个列表中滚动

2 个答案: